Variety traits

Frost hardiness

Frost hardiness is the genetically determined ability of a plant to withstand exposure to sub-zero temperatures without tissue damage. This indicator reflects the critical temperature threshold beyond which the plant dies.

Mentioned in descriptions 11 978 varieties reference book.

Frost hardiness represents the ability of a plant organism to resist the impact of low sub-zero temperatures. It determines the critical threshold above which plant tissues undergo irreversible damage or death. Unlike overall winter hardiness, which also accounts for damping-off and the effects of thaws, frost hardiness focuses specifically on the cellular response to cold exposure.

This trait is genetically determined; however, its expression depends on the physiological state of the plant and the dynamics of external conditions. Frost hardiness is not a constant value: it increases during the period of deep winter dormancy and gradually decreases towards spring, as the plant loses its ability to resist cold due to dehardening.

The evaluation of frost hardiness during variety testing is conducted through laboratory freezing in controlled conditions or through long-term field observations of crop survival. For variety comparison, scoring scales, percentage of survival, or the determination of minimum permissible temperatures in degrees Celsius are used. Maximum realization of the innate genetic potential for frost hardiness is ensured by optimal sowing dates and adequate phosphorus-potassium fertilization in the autumn.

Sources10

Breakdown by crop

Frost resistance of roses 263 Frost Resistance — Hydrangea macrophylla 162 Grapevine Cold Hardiness 152 Lily Frost Hardiness 106 Apple Frost Resistance 84 Grapevine Cold Hardiness 78 Clematis Frost Resistance 71 Tulip frost resistance 64 Peach frost hardiness 52 Frost resistance — soft wheat 44 Frost Hardiness of Rhododendron 36 Frost resistance of Heuchera 36 Frost resistance of common heather 30 Frost Hardiness of Zantedeschia 29 Pear frost resistance 24 Frost Hardiness of Sweet Cherry 24 Apple Frost Resistance 24 Gladiolus frost resistance 24 Cold hardiness of fig 24 Chrysanthemum Frost Resistance 21 Plum Frost Resistance 19 Apricot frost resistance 19 Frost resistance — garden strawberry 19 Blueberry frost resistance 18

Found in these crops

Grapevine 301 Rose 193 Lily 150 Common grape vine 142 Apple 119 Tulip 112 Bigleaf hydrangea 82 Clematis 66 Peach 63 Bread wheat 56 Azalea 44 Highbush blueberry 42

Varieties that feature this in their description

Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.

Electric Red

Withdrawn

Dianthus caryophyllus L. · Carnation

Hans A. Hansen

1 record

Healthy Mammoth Two

Active

Sequoiadendron giganteum (Lindl.) J. Buchholz

Cornelius P.F. Kools trading as Sierteeltkwekerij Kools

1 record

Firestars Firestarter

Active

hybrids between Crocosmia masoniorum (L. Bolus) N. E. Br. and Crocosmia paniculata (Klatt) Goldblatt

Paul Lewis

1 record

GRHYARUP4

Application submitted

Hydrangea arborescens L. · Smooth hydrangea

Guido Rouwette

1 record

Ferris Wheel

Withdrawn

Hybrids between Echinacea purpurea (L.) Moench and Echinacea paradoxa (Norton) Britton

HARINI KORLIPARA

1 record

Golden Carpet

Terminated

Spiraea L. · Spiraea

Huber Tony

1 record

EVIPO106

Active

Clematis L. · Clematis

Poulsen Roser A/S^^^Raymond J. Evison Ltd.

1 record

ET LPN 709

Active

Lupinus L. · Lupine

Eternal Plant Boijl B.V.

1 record

ET EPB 1717

Active

Helleborus orientalis x Helleborus x ericsmithii

Eternal Plant Boijl B.V.

1 record

Go Go Red

Active

Astilbe x arendsii H. Junge · Arends astilbe

Maatschap Dhr. J.W.M. van der Meer en Mw. E.H. van der Meer-Godijn

1 record

Funky Spinner

Active

Heliopsis helianthoides (L.) Sweet · Oxeye sunflower

Jelitto Staudensamen GmbH

2 records

Delicious Candy

Active

Echinacea Moench. · Coneflower

Marco van Noort Breeding B.V.

1 record

Emilia

Terminated

Vitis vinifera L. · Common grape vine

Gertrude Mayer ^^^Georg Weiss

1 record

FLORSEGWL

Active

Hylotelephium telephium (L.) H. Ohba · Orpine

Florensis B.V.

1 record

Gaby

Terminated

Syringa vulgaris L. · Common lilac

Hortival Diffusion S.A.S.

1 record

Ebony

Withdrawn

Leucadendron laureolum (Lam.) Fourc.

King Flora Nurseries

1 record

FLOAH18013

Active

Aster dumosus L. · Bushy aster

Florensis B.V.

1 record

Felix

Active

Magnolia L. · Magnolia

Mark Jury

1 record

Cool Blue

Withdrawn

Ceanothus impressus Trel. · Santa Barbara ceanothus

Huisman Boomkwekerij B.V.

1 record

ET LPN 815

Active

Lupinus L. · Lupine

Eternal Plant Boijl B.V.

1 record

Erik

Terminated

Salix L. · Willow

Stig Larsson

1 record

Evipo116

Active

Clematis L. · Clematis

Poulsen Roser A/S^^^Raymond J. Evison Ltd.

1 record

Emotions

Terminated

Lilium L. · Lily

Hoffgaarde B.V.

1 record

Detroit

Terminated

Lilium L. · Lily

Vletter & Den Haan Beheer B.V

1 record

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Variety traits

Maturity group 89 063
Yield 67 000
Vigor 53 548
Plant height 51 504
Lodging 50 198
Taste and aroma 36 010
Variety origin 29 523
Productivity 27 845

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.